Telephone system



March 31, 1925.

J. F. TOOMEY TELEPHONE SYSTEM Filed Oct. 11, 1922 3 Sheets-Sheet 1 I 071/6/7/0/7- Jo/vn f 75007 304 J. F. TOOMEY TELEPHONE SYSTEM Filed Oct. 11, 1922 3 Sheets-Sheet 3 MA RSI/VAL POL A R/ZfO Patented ar. 31, 1925.

JOHN F. TOOMEY, OF NEWV YORK, H. Y., JESSIE-N01! TO AMERICAN TELEPHONE AND TELEGRA?H COIVIPANY, A CGREORATION ZIEW' YORK.

TELEPHORE SYSTEM.

US/ 18th it may concern Be it. known that 1, JOHN F. TooMnY, residing at New York, in the copnty of New York and State oi? New York, have invented certain Improvements in Telephone Systems, of which the following is a specification.

This invention relates to telephone systems and more particularly to systems in which trunk lines are employed for connect ing different switchboards or operators positions.

The usual practice in telephone exchange systems is to trunk connections for toll service from the originating switchboard or A operatoW-s position to a recording toll operators position over recording trunk lines. The recording operator,in answering incoming upon a toll trunk records upon a ticket the details f the call, as given by the calling subscriber, and notes, the class of the calling subscribers line. Upon the completion of the recording, the recording operator dismisses the calling subscriber and immediately releases the recording trunk. llhcn the trunk is released, the A operator receives a disconnect signal and disconnects from the calling line, regardless of the calling suhscriber s supervisory signal. The recording operator then secures the calling suhscrihens line over a toll switching trunk, enters the number of the trunk on the ticket and forwards the ticket to the toll operator at the toll line position. She may then hold the trunk until the toll operator has taken up the trunk. he established connection then extends from the calling suhscrihers line over the toll switching trunk through the toll opcrators cord circuit, and thence over the toll line to the. desired distant station, and the A operator and recording operator are free to perform other duties.

In order that the operator at the recording toll position may have the complete data i e-r re irding the toll call upon the ticket, it is necessary to transmit to her, information. regarding the class of service to which the calling s1 hscriher is entitled. Hererot'cre, in some exchanges in which subscribers ess to recording toll trunirs and to rators position, the A. operator the class of service, tn suhscriher is entitled, by means of w. [hill the a distinctive lamp cap on the calling lamp associated with the jack of the subscribers line and notified the toll operator in case the call is from a coin box line or from a line to which toll connection should be re fused.

To relieve the A operator of the necessity of advising the toll operator of the class of service to which the calling subscriber is entitled, groups of recording trunks are provided in certain cases for each class of service, these trunks being equipped at the recording toll position with distinctive lamp caps so that the A operator could select a recording trunk corresponding to the class of service indicated by the calling subscribers lamp, the recording operator being advised of the class otservice of the calling subscriber by means of a distinctive lamp up associated with the trunk answer ing jack. The recording toll operator may thus readily determine from the lamp cap associated with the trunk the class of service to which the calling subscriber is entitled. This arrangement obviousl involves the employment oi a greater number of recording trunks than is necessary to adequately handle the maximum volume of trafiic, and since the toll position may be and often is situated in a distant ofiice of the exchange, the employment of several groups of trunks .may prove to be an expensive item in the cost and maintenance of the system.

, In my Patent No. 1,488,847, issued April 1, 1924-, there are described and claimed systerns of thissort Which obviate the aforesaid ditliculty by employing a single group of trunks over which indicationsof the class of service may be selectively transmitted to the recording operators positions, as Well as means for selectively operating one of a plurality ct class denoting signaling devices over the trunk line in accordance with the r particular terminal or jack employed for connection wi h the trunk line.

A feature of the present invention is to make it possible for a subscriber or local crater to have access to dii erent operati 's' positions at. a toll otlice and to not be limited to connection with single operator. ich a condition may exist in cases wherein a subscriber or local operator may desire telephonic communication with the particular person recorder, the two number recorder orto any other special operators or desks in the toll ofiice. Conne'otion is also provided to an operator Who is not required to receive an indication of the class of service to which the calling subscriber is en'- titled.

Uther features of the invention not specifically mentioned, Will appear rein the following description taken in connection with the accompanying drawings, in which Figure 1 shows the outgoing end of a toll trunk together with associated signal transmitting apparatus, the cord circ'uitof an originatin A operator and :a line of a calling subscriber. Fig. 2shows .theincomin-g end of a toll line together With associated appuratus, and Fig. 3 shows the cord circuit at a recording tell operatore position, and signaiing apparatus associated therewith and common to the cord circuits of the positions,

A clearer understanding may be had from the following description of the method of extending connections, first from the line of subscriber A to an operator at the recording toll station, Who requires knowledge as to the class of service of the calling subscriber, and second from a line of a subscriber Ato operator at the recording toll station who may or may not require knowledge as to the class of service necessary.

Subscriber A, upon removing his receiver to initiate a call, establishes an energizing circuit for line relay at which may be traced from grounded battery through the lefthand Winding of relay 4-, outer left-hand armature and back contact of cut-off relayfi, over the substation line loop through the inner armature and back contact of cut-ofi' relay 5, rigl'it-hand Winding of relay 4 to ground, Line relay 4 thereupon is actuated and establishes .a circuitthrough its armature and front contact for line lamp 6.

The operator at "position O, upon noting the illumination ofthe sub-scribers line lamp 6 inserts the plug P of an id-le cord circuit at her positionin the jack J of the line with which lamp 6 is associated, whereupon cutoil relay 5 is energised over a circuit extending from grounded battery through the supervisory lamp 7 over the sleeve contacts of plug P and jack J, Winding of cut-off relay 5 to ground. Relay 5 opens the circuit at its contacts for relay 4, whereupon the energizing circuit for line lamp 6 is interrupted and the lamp extinguished. Super visory lamp 7 does not become illuminated though included in the circuit just traced as relay 8 becomes energized over the subscribers line'loop in the Well-known man ner upon the insertion of plug P in jack J and closes at its armature and front Contact a circuit in shunt of the lamp 7.

he operator then throws her listening The lamp cap of fine lamp 6 inforn'is the operator of the class of service of the calling subscriber. The operator then inserts plug P into jack J thereupon extinguishing the lamp.

Upon insertion of plug P- in jack J a circuit is established from grounded battery through the callin supervisory lamp 1U, sleeve contacts of P and jafck J condoctor 12-, winding of relay 13, conductor 1 and left-hand armature and back contact of relay 15 to ground, through the resistance element 16. 1.0 is illuminated in this circuit and relay l3 energized. Relay 1&3, upon energization, establishes a circuit for the switching apparatus or rotary tirne relay 17 which may be traced from ground-ed battery through -;tlse -.armatures and back contacts of relays 18-, 19, 20, 21 and22, conductor 2'3, right-hand armature and front contact 'of relay 13, conductor .24, conductor and thence toground through the motor 26. A branch of the circuit above traced extends from conductor 25, over conductor 2?, brush 28, collecting ring 29, winding of clutch magnet 30 and thence to ground. In response to the energization of Inotor 26 and of clutch magnet 30, the motor 26 drives the brush arm of time relay 1? in a counterclockwise direction, .advancin-fl the brushes 31 over the terminal bank 32. 'fhis switch may be of the type disclosed in a copendi'ng application, Serial 329,801, filed October 10, 1919, and therefore need not be described i'n detail herein.

Upon the energization of relay 13 and the establishmentot the circuit for starting rctary time relay 17, a, circuit is also established in parallel With the circuit previously traced extending from conductor to ground, through the Winding of relay Relay 3-3, upon energizing, connects grounded batter and ground, respectively, to the ring con 'uctor 3-1 and tip conductor of the recording toll trunk extending to the recording toll operators position, whereupon a circuitis established for theline relay 200 at the incoming end of the toll trunk. This circuit may be traced from grounded battery, through the left-hand armature and front contact of relay 33, the lower armature and back contact of relay 36, trunk conductor 84, lower let-hand Winding of repeating coil 201, both windings of relay 2-00, the upper left-hand Winding oi" repeating coil 201, trunk conductor 35, upper armature and back contact of relay 3%, and thence to ground through the right-hand armature contacts of relays 204-, 205,

and front contact of relay 33. Relay energizes in this circuit and at its armature and front contact closes a circuit for rel av 202.

Relay 202 closes at its right hmid armature and front contact a circuit for i Q a rotary time relay This (-llti'it line be traced from r-rounded batterig throu 'h b i 21 the inner right-hand ariha ares and bar:

E20 3 and conductor 208, inner right-hand arznutnres and back contacts of relays 20$ 0, 21 l and 2. Conductor 213, right-hainil armature a back Contact of relay E3121, comliietor right-hand armature and met relay 202, conduetor 21%;, tl. circuits through the motor clutch mag-net 219 ot the rotary 203. The energization (r re (l1'l\ 2&8 and of the clutch inag'ne movement of the brush arm of t counter-clockwise direction t brushes 220 over the terini From the preceding tlQSClli noted that the rot-airy time elay at the opposite ends of i i started into operation at :-;1 same time, and since these rob adjusted as to operate at the ssince the lag in the starting lay 203 at the incoming and q I due to the time lapsing al er of time relay 17 because energization of relays 3 3, readily be compensated tor, lays, therefore, move their r 31 and 220 over their con niinal banks in substantial in, Upon actuation of the rotary 20?, a circuit for relay 210 is CSllll) tending from, gl'QlilldQil battery t. break contacts of the leli-lia-nil are. this relay, conductor 223 the .u active terminals hi-i l ca 224 to ground at the armature Zll'lll l wr H tact oflline relay 200, \\l1l('l1 or. gized as described below. It energizing, establishes a lot-h itself traced "from grounded lietlery.

the winding and the i'iialie contacts in condiiei or them-e to left-hand armature oi relay l llil 294, winding of rela 2Q" ground at the break cuni'z; v right-hand armature oi rel 225 energizes in this circuit the following circuit for lain. grounded batter through ii-e armature and front contact of (since relay 200 is now en i/mit scribed below), conductor M hand armature and back eontaei 226 eondnotor 2239., contact and arm rein comlurtoi' 23:3 to Q'lOMiMl the filament of snpeiwisory lamp illumination of lamp signals the roll (fly orator that a call awaiting attention on the toll trunk \Yitl'i which the lamp is asn'hich is energized in le'ill extending soeiated. Relay a branch of the l ii;e mt 3 list it naled. The continue to brushes 31 over ti ninals oi tel-r il bank 32 until. the broi ers engage tor .als .54 correaponding L Wl! haa been enni lo-r lire establishment oi Iiie connection. A UlEL'lUl' will be eritihlis for rela 19 which 111a; be traced oin grounded hatter through the winding oi relay 19. the nornizill Coxed tare eonlziets of the let'lkhand armatu e of this relza nc inductor 23R, ill LUl'ltlili" $39. A ductor ell) to glfluilltl. throiz h left-hand ll independent oi 1 of the rotary time relay 1T. 1 11s i iliiig circuit is traced from groundeC battery ti rough the winding of relay it thror h the maize contacts of its, left-hand :einiatine conductor and thence to ground over t e cireuit previously tic-awed at the left-l2 l arnmtures and 'i'ont cow last, ll: 1 i? it -i ggihbhaiial i, opens the h motor ill-3 and time relse i )1 armature and circuit eiiteisili igf fl. clutch nr 17 which rotary movement and tion of the clutch 3 of the relay return as shown in Fig. 1.

Upon the out the u, Ill), the bin normal po;

cult of rela; SS is also up being quick to release. opens the e the line relay 200 at the inemningz; e toll trunl; beiiore d 3C operates a eii'mit through the rig 'h a! tact of rela 19. Th be traced fro i i '1' and our contact armature and front the right-ha; of rela l8.

contact of relay g i. 1, through the wind 11. 1;: relav .36. it e slow operating Cliail'zlCttEUSllcS of relays oil and 43 are designated on the drawing by arrows pointing in the direction in which the armatures slowly move.

The momentary deenergization of line relay 200, following the deenergization of rclay 33, opens the circuit of relay 202 which at its right-hand armature and front con tact opens the driving circuit of rotary time relay 203, thus the forward rotary movement of the brush arm of rotary relay 203 is checked immediately following the ener ization of relay 19. Upon the advance ot the brush arm of rotary time relay 17 to a posi tion corresponding to the jack J which has been employed in the estal'ilishn'icnt ot the connection, the brushes 220 of the time relay 203 will, tl'icretore. be positioned upon the second set of active terminals 222 in this terminal bank During the momentary dcenergization of relay 200, and while brush 220 is in engagement with terminals 222, a circuit is established for relay 210 which is traced from groiunled ha tery through the break contacts of the lctt-haud arl'nature ot' this relay, conductor 223. the second set of active terminals 222, brushes 220, conduct-or 224 to ground at the armature and back con tact of line relay 200. Relay 210, upon energizing, estahlishar. a locking circuit for itself independent of the terminals and brushes 220 and ot the line relay 200, which may be traced from grounded battery hrough the winding of the make contacts of the left-hand armature of relay 210, conductor 294, winding of relay 225 and thence to ground at the break contacts of the inner right-hand armature of relay 226. At its right armature and back contact, relay 210 opens the driving circuit for rotary time relay 203 to prevent a second operation of this relay upon a subsequent energization of relay At its outer right-hand armature and back contact, relay 210 prepares a circuit for relay 205 which circuit becomes Tcctive following the response of the record iug toll operator. By the opening of the circuits of the driving motor 218 and (it the clutch n'iagnet 215), the brush arm of the time relay returns to its normal position.

Following the encrgization of slow-to-elr rgize rel 36, the circuit of line relay 200 is reestahlished and relay 200 again closes the circuit of relay 202. Relay 200 is now energized over a circuit which is traced from grounded battery at the cord circuit of position U, through the lower right-hand winding ct l'Glltilt'lllfi coil 44, the vinding of cult lug supervisory relay the ring contacts of plug P and jack J conductor 46, the lower armature and front contact of reav Stir conductor 34, the lower left-hand winding of repeating coil 2 4 i. winding of relay iii-t). upper l ft-hand winding ot repeating coil 20!, conductor 35, upper armature and front contact of relay 36, winding of relay 48, trunk conductor 47, tip contacts of jack J and plug P and thence to ground through the upper right-hand Winding of repeating coil 44. The current fiowing iii this circuit while sufficient to energize the line relay 200 is not sufficient to energize either relay 48 or supervisory relay 45.

The recording toll operator at position 0' in which the toll trunk line terminates upon noting the illumination of the trunk line lamp 227 takes up answering plug P" of an idle cord circuit and inserts it in the jack J of the toll trunk corresponding to the illuminated trunk lamp 227. A circuit is thereupon established which may be traced from grounded battery through the winding of marginal sleeve relay 350, conductor 301, winding of sleeve relay 302, sleeve conductor SE03, sleeve contacts of plug P and jack J conductor 236, and thence to ground through tut winding of sleeve relay 237. Sleeve relay 350, being marginally wound, does not receive sutiicient current when connection is made with a toll trunk line for causing its eucrgization but relays 302 and 237 become energized in the circuit just traced. lelay 350 is provided with a marginal action for a purpose which will be hereinafter set forth.

Relay 237, upon energizing, establishes a shunt around the left-hand high resistance winding of line relay 200, which shunt extends over conductor 238, left-hand armature and front contact of relay 237 and conductor 239, Due to the shunting of the high resistance winding of relay 200, current fiow 'ng over the circuit previously traced extending through the winding of relay 48 and the winding of supeiwisory relay 45 is now increased to such an extent that these relays become energized in series with relay 200. The energization of supervisory relay 45 establishes a shunt around the calling supervisory lamp 1O whereupon this lamp ceases to he illuminated. The energization of relay 48 establishes a circuit for relay 43 which may be traced from grounded battery through the winding of relay 4Z3, conductor 45) to ground, through the armature and front contact of relay 48. Relay 43., upon cnergization, closes a circuit extending through the high resistance right-hand winding of relay 15, which circuit may be traced from grounded battery through the arn'iature and front contact of supervisory relay sleeve contacts or" plug P and jack J conductor 12, winding of relay 13, conductm' 14, the left-hand armature and back contact of relay 15, right-hand winding of relay 15-. conductor 50, and thence to ground at the an mature and make contact of relay 43. Relay 1;": energizes in this circuit opening at its left-hand armature and back contact the circuit just traced through its high resistance righthand winding and removes a shunt existing no to this time aroinid its letthand iding. Relay is t! fore maintained energized orer the circuit. previously traced extending; from conductor 14 through the. lett-hand low resistance Winding of relay 15, conductor 50 and to ground at the make contacts of th ture of relay 4-3. Relay 15 at it" I armature and front contact prepares a circuit tor the peremptory disconnection relay 51, wnich circuit will be traced hereinafter.

At the incoming end of the toll trunk upon energization ot rela 533?. a circuit is established for relay 2% which in J be traced from grounded battery thronen the right-hand armature and tront conta t f relay 2S7, conductor 240 to ground through the. winding of relay 2%. Relay 926 at its outer left-hand armature and back coitact opens the circuit previously traced extend: ing in parallel hanches through lamp 223? and through windings of relay 227 thereupon becomes extinguished and re lay 228 becomes deenergized and disconnects the source of tone current an: upon the coin duetors Q-lt ant of the toll trunk.

Relay 1 ancc wii illit- T V linen) 226 at the brea; contacts: of its ner right-hand armature opens the lock ng; circuit preriousl trzced extend through the finding of relay 21G. Relay l is e locked over a new holding circuit extendin 't'roni conductor through outer-rig 3 hand a mature and front contact ot lt. 226, conductor Q41 and thenc to ground through the outer lett-hand arinatures and back contacts of relays Q07, 205 =id is thus removing the control of the l jwlting' circuit of relay 211') from the emitacts of relay 226 to the contacts ot relax 903, which relay is now energized over a circuit extending from grounded battery, the winting and break contacts and inner lett'ha i tures of relay conductor r outer right-hand armature and .troit contact of relay 210, conductor 2 1 3 to ground at the inner right-hand armature and trout contact of relay Relay 205 at its outer lett hand armature and b2 ole contact now opens the substit'iue. locking: circuit ot relay F210 which beconws deenerggixed. Relay at its inner rightdiand armature and har c n J l iact opens the circuit previously W to prevent l c'uit ictor Ell-o men; ot' the driving circuit ine rela ll-en relay 210 becomes deenereized, at outcr right-hind armature and front conta it prepares a circuit for selectively pt inn class of service lamps associm the recording toll operators t'ni'il cvrcui a manner lu-rrinaiter descrihol.

I'll the recording toll oi ieratorl 3013 ecomes ener rized in il.

atter descr bed.

armature. el:

At. its inner right-hand O2 establishes a circuit for I no from grounded battery through the winnings of relay 305, right- A d arnia ore and hack contact oi relay 304i, conductor inner right-hand armature and front contact of relay 302, conduct r 3308 to hrough the contacts 309 int: my 310, provided e lacy 3 ill is in its norina position in which .-.e operator's telephone set, indicated by O. s connected to th talking strands of the cord circuit. Relay 05, upon energization, establishes a simplex operating circuit for controlling the selective operation 01 one of 4.

relar 305 extenhe class of ser ice lamps associated with and common to the cord circuits of the operators position 0.

It hating; been assumed that the responsire device or relay 205, associated with the 2; end of the toll trunk, has been seerated through the functioning y t me relay 5203, the control cirera ing the. class of service sigraced as follows: from the norms clos are. connneto and front contac contacts of the talking key 3 and 314. the arinatures l s of relar 305, conductors l 31), theuc; to the midpoint of coil n uctor to ground. through the of marginal relay 319, the winding ized re ay and the winding of relay 321 Since the current flowhis circuit. is impressed from a posiingr; in t. A tire pole o't battery 2H and through only a portior 245 of the resistance element associa ed with battery 94%. the marginal relay i.) at the cnoratofs position receives sntlie ent currei'it to energize in series with relay 321. lol "'sed relay however, does not energitfc since it. attracts its armature only when current of a negative polarity is imnrt d upon its windings. With relays 319 and 391 energized. a eireni 't f )1 class of servi e ilot laam 32:2 estahlis hed which may he tr. y. t am gronnded battery through lare outer rightdiand armature and act of relz-iy 319. armature and t relav to ground hrouejh and trout contact 0? relay 3th. lamps 322. 323, and re nrovided in the well'known manner 'ont . inc-tire inninc' 'rorrespoialingg to cap; wl... .i are oh: edupon the line lamps Corresponding to hnnp (:3 o subscribers lines and the toll operator, l 3- noting the illuminat on of 2: pilot l linnp, its 322, is advised concerning the chi service to which the calling subscriber 13 en titled.

It is to be noted ii if responsive device Lil i hurl been operate clue to the seizure of jack ,l at end of the illtdlll, then rcsstiinco V 248 would have been include-C. in the ei previously traced from battery zit throw the windinqts ofrele e 319. Zr

W anti 32;. :i f in this eient, marginal relai Si) would not have received siitiioient current to energize. and consequently it circuit for lamp 322; would have been establiehed t'roin gronnrle i battery through lzunp 3223, th outer arenature and back ontact of rehiy 3H the arenati re and back Contact of rehi i 3:30 and to ground at the armature and i i t of relay 321. Had responsii'e device 2th; been energized, a negative or rent i'roni hettery 2 3 through resistance 275 would. have been ini )ressed upon the control (Iiiiiiii tllit relays 53:20 and would all have her-2 energized since new the polarized relay 2352c responds to the negative bin-rent. till'll 325 would have been llliilill'iiii ifi. s milar manner, had reepzinim-rle been energized, current tron.

would have been llll pl'iiifiiiil iipoi circuit through LKNWHHVK? ole;

and relays 320 and 321 (mil hire spoilled antl'tlie circuit of lamp would have been established.

The recording; toll operator upon the illumination of clues oi r 'rirfand upon receiving insti -l(" calling snl'iecriher as to the sion of the eoi'incetion. recoro tion on a ticket in the usual in the (Qn'lplOi'lOTl of the recowi :itor dismisses the calling in;

ployed, by throwingthe hey Si) in; position. Contact 309 of now open and the circuit previous through the Winding oi relay thereby interrupting the signal i-ontrol cuit previously t'zicetl for controlling the operation. of the rinse of service hinips. lays 319 nntl 321 now become lee'ier i and lamp 322 extinguished. it the op rator desires to relight the lamp 227323.. i 'm to check up the class of Service to v-xh'nh tho calling subscriber is ntnleil. who HWY ilo so by throwing the he lit to the 'i: position, in which position contacts ill). are closed and. the control cirouitr; 'o wl v traced are reestablished. Til. 1. howeroiz may be clone only when plug l in in? J since the circuit or" relay not only dept Hi5 upon the closure of rontzielti one l also upon the energ .zrtion i 1101?. Folloi'lng the completion of it? cnllt tin operator release; the 1t'-t* )l'(i11f f g plug if 'roin inch it proi'io tim'wl tiiroiz h the ii'intlings of relays opened thereby openi,

in;;;' circuit oi relay .26 zirnritnre rind irrnt CUlliilL' Relay however, tine: .i at t e; time einee rel ve filth} enil 202m? still maintained energizei over the toll Rehiv upon tie-energizing.

l moves the shunt in around ihr high re- 53st zine-e Winding of relay 200, whereby he current flowing over the trnnl' thronoh l \a'intling of relays (fl( fif-Q-(l to SiiCll an rein l5 and relay 'll ene i' zml. openyi the I \i'hich. after :1 Plb-{ltitl'tili re new and closers circuit or eronnalerl ba tery through th [17%. the \'iii(li]i of rehi 'ht-hziinl armature iiftfirilit (u)- oi r 5 l5 and thence int-l; millet-t ol' rehi ii-3. (new 21ml over the ii ;A- both of rrnnitnre Zillti l'ro' i contm't 1 oirouit int initte,

Winding); oi relay :n'w through the re yht-htinil \E'iEVlii'ljl' oi' zi 13th flilti then-Po U) Q'l'iHEll-i ti and Front rontnci v nee ol' relziv 13 being time ,1:

iv the liiiioiit fioviii g' ore! flPiQ conductor l! is the; intermittent iii(l9.". tl. filll since at this time rein; in tleenin'nhaetl 11ml 1h rlitlli Visor lnnip iii is. therefore. 'i'ililt; lain iii lleisshw peremptory disconnect H2 4!- l'li 3 this f-i f| l t ion il 1* net-thin. rezir-ilh-rh oi' whothinn? HQMRViSOH' lump 1' rig calling; subscriber he, hung: 1; or not.

The orisiinn the plnr; l

t extending; t

ML-A

r. iili :iinl the rehiv 2M) ti l i which in tiny circuit of rehii' 2 =1.

' in: opeip: the .Mfi-Tlllil' c 1 3 1 i a", i irzireo. through we llii'illifl oi ionrro' l-iil incoming end of the toll trunk is restored to normal condition. At the outgoing end of the toll trunk, the withdrawal of the plug P from the jack J also opens the circuit preyiously traced through the windings ot' relays 1S and 15 and the apparatus at the outgoing end of the trunk is thorehy restored to its normal condition.

The recording toll operator now proceeds to secure a connection in the usual manner to the willing snhscrihers line over a toll switching trunk (not shown), and having ohtained such connection, holds; it; hy inne ting he plug of a holding cord r rcuit (not shown) in the in "tuning jack of the swit hirig trunk and records the number of the switchin;: trunk employed on the ticket which rho previously made out. She then traneniits the ticket to the toll line operator who has acres to multiples of the switehing' trunln; and to toll lines. The toll operator after receiving; the ticket, proceeds to ohtain the desired toll roiuicction. and after ohtaiuing the connection. connects the willing suhscriherto the toll lino over a multiple ot the toll ewitching trunk. As soon as the toll operator takes; up the toll switching t1'unk.tl1e recordingoper: tor rcreiyes' a disconnect signal at hcrholdi cord cirzuit and thereupon take cord circuit. Inasmuch as thi does notv involve the consideration establishment of the Connection beyond the recording operator's position. he other cirruits employed to complete the toll couno lion have not been v hown or dcwrihcd in v 1-- tall herein.

'l'h-c operator at pmition may he ill poeition O j' witlu ra the plug I iron] the cl; (l and reiusertiuq it therein whe eupon relays i and il ltl he our-r momentarily (lt(ll(*t 1'l7f((l. The deen rg'izzr tion of relay 42* has, no etiect' sine-e it doee not on the circuit oi slow release relay ill tor a iricnt time to eause ita (lQQlltl'Ii3itiii-fl;. lhc d nerg'ination of relay 200 opens the ir uit nl' relay 502, which at itl r't t hi l armature and hack eontact, closes a rireust tor relay 2t? extending from grounded hatteryg through the left-hand armatur and haul: eontaet oi relay Q02. conductor SE -l. innelet't-hand armature and trout "out-act of relay a rd theuee to ground through the winding r inxcntion of relay 2-17. Relay 2+7. upon cnergizing. momentarily estahlishw a circuit 't'or relay Sill which may he traecrl from grounded battery through the lower arniature and front contact of relay 247. trunk conductor 249. the ring contacts of jack J and plug P, the innermost lower armature and bark contact of relay the outer right-hand armature and front Contact. of relay 302, conductor 330, the left-hand winding of relay 304, conductor 331. the innermost upper armature and back Contact of relay 350, the tip contacts of plug P and gzing', locks up. as previously described. and eetzzhluahee; th t'llN-lli tor laiugi 3534.

t houl l the rerouting toll operator at 0' (l9? to re ail the originating operator at position t). she may do so hy intermittently \i'ithdrawi-ug the plug l 'l'rorn the jack J". Piineeat this time, relay M0 is energized o er the toll trunk tlcrehy maintaining relay energized. which relay in turn maintain i r IlllQ cirruit tor relay the withdrawal oi plug 1 and the cornequent deenrr i Ir. of relay tloefi not permit relay to tleen rn' xe to reetore the siigz'nah ing apparatus llltlll 'lillif relay 205. The intermittent -;leencr i;cation of relay 237. how ewr, opens and closes the ehunt around the high FOS StUIHO w ndim: of relay Qt-t). thereby rousing the in lay l8 and supe i termittent ope "ation of resorv re av 4-5.

nenrrgization of relay 18. the

Upon tllt'il circuit of relay i3 is open out as relay 43 is slow to release it does not deenerglize between i tcut denier .ations of relay 48. intermittent operation of superyisory relay 4:) intermittently removes the shunt aroind euperyieory lan'ip lt so that this hoop lawns in lllllwhl mt; he uuhninwal all llt-( 'l'llll ot' plug: l" at the toll poe-ition.

t] h opcratm'. noting the tlaehinp; of this lanlu. throne her li ten t il' k y 9 iii (touhz-r h -a l sot with the strands of hcr il u' uit. h Eur-y now ro iyeree w th the operat r at i on t) as soon as he oper- 2 a l po itiou l't lqitll th plug l to tit uni-1 and 'irowl her key ill) t ate talking position, it m y he le ira le t p rloit the recording toll operator to have i he ins: euhsicrilver r l feature heur oi especial mportnn e in financial distiietsi. The telchrol er s otlicee are tcrinino e toll operators tor the ated (ii I iurnose ot gg iyingr Such lines quirk toll eirc To enahlo the toll operato' to SllPPI rise such connection and to supply [HllCll ralling' lines with talking current. it then he comes nerewary to equip the amwerimr end of the toll rortl cir uitn with apparatus r:- pcrir. ly deuig ned for thin purpoP-e.

ll hen :2 oil op ra or an iwom iliattwl up i wit a m iscril e li scrt thc :21: l" n the iaclt ot' the railing: line. r circuit is (*iHlJllF- lttl of the calling! lin a r. d

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the supervisory lamp 334 and through the auxiliary lamp signal 333. These circuits remain closed until the operator restores the key 310 to its normal position, in which position, her head set is again connected with the strands of the cord circuit.

Relay 237, upon deenergizing, opens the circuit of relay 226, and since at this time relay 202 is deenergized, relay 22o becomes deenergized opening the circuits of relays 247 and 205. The circuits at the incoming end of the toll trunk are now in normal position.

At the originating operators position, upon the withdrawal of calling plug 1 from the jack J, the circuit previously traced through the winding of relay l3 and the winding of relay 15 is opened and these relays become deenergized. The circuits at the originating or outgoing end of the toll trunk are now restored to their normal position.

Assuming now that tin-subscriber at line A or the operator at position desires to signal an operator at a position other than the one designated by the illumination of lamp 227 as described in the foregoing description, the A operator inserts plug l into jack J which jack corresponds to the position of the operator whose attention is desired, which position is shown on the drawing terminating in jack J. The jack J 7 may designate various positions, such as that of the particular person recorder, the two number recorder or any other special operators or desks in the toll oflice to which a subscriber or local operator may wish to be connected.

Upon insertion of plug 1" into jack J a circuit is established for relay 100 which functions in the same manner as relay 13, previously described in connection with a call being extended through jack J It is thought unnecessary to trace out all the steps necessary to effect the illumination of lamp 400 associated with the position of the desired operator since the procedure in this case is very similar to that followed out in connection with the illumination of lamp 227 but wherein these steps differentiate and where new apparatus is employed the separation will be readily obtainable from the following description.

Subsequent to the insertion of plug P into jack J and the energization relay 202, the time rotary relays 17 and 203 are synchronously operated, as hereinbefore described. In this instance, the brushes 31 and 220 will travel over their respective terminal banks until the terminals 401 and 402, respectively, are reached. Brushes 31, upon making contact with terminals 401, establish circuits similar to those previously described in connection with terminals 37 and need not be traced out at this time.

Brushes 220, upon making contact with the terminals 402, establish a circuit for energizing relay 214 which may be traced from grounded battery through the winding and the break contacts of relay 214, conductor 403, the set of active terminals 402, conductor 224 and to ground through the normal contact and armature of relay 200. Relay 214 energizes in this circuit and closes a locking circuit for itself extendin from grounded battery through the win ing of relay 214, the armature and make contact of relay 214, winding of relay 404, conductor 405 to ground through the right-hand contacts of relay 226. Relay 404 energizes in this circuit and establishes a circuit extending from grounded battery through the left hand armature and front contact of relay 202, (due to energization of relay 22, relay 30 having now energized and operated relays 200 and conductor 229, outer lefthand armature and back contact of relay 220, conductor 230, contact and armature of relay 404, conductor 406, thence to ground through the filament of lamp 400. Lamp 400 thereupon is illuminated to signal the desired operator at the position with which the lamp is associated that her attention is desired.

In systems of the nature just described, it is not always necessary that each operator be notified as to the class of service to which the calling subscriber is entitled and it is, therefore, a matter of requirements whether or not the circuit arrangements including class of service lamps, such as 322, 323, 324 and 325, be provided, but it is obvious from the foregoing descriptions that any one of a plurality of operators may be selectively signalled and may or may not be informed by class of service lamp signals as to the class of service to which the calling subscriber is entitled.

The number of operators that can be selectively signalled is limited by the capacity of the rotary time relays since for each operators position, there need be a duplication of the apparatus mentioned in connection with the illumination of lamp 400.

\Vhile the invention has been disclosed in connection with circuits operating upon a manual basis, it is obvious that the multiple terminals of the toll trunk at the originating operators position might terminate in the terminal banks of selector switches, as shown in applicants Patent No. 1,492,868, issued May 0, 1924, and be selected automatically by the functioning of the switches in accordance with digits dialed either by a calling subscriber or by a semi-mechanical operator.

What is claimed is:

1. A telephone system, comprising a trunk circuit terminating at one end in a plurality of sets of switching terminals. a plurality of operators positions at another end of (j ii said trunk, a cord circuit, a signaling device at each of said positions, means for selectively actuating one of said signaling devices upon connection of said cord circuit with said trunk circuit, class of service indicating means associated with one of said positions and means responsive to the seizure of said trunk at said second mentioned end for operating said class of service indicating means.

A telephone system, comprising a trunk circuit, a group of signaling devices for said trunk circuit, cord circuits, a group of class of service signaling devices for one of said cord circuits, and means for actuating a signaling device in each of said groups upon connection of said cord circuits with said trunk circuit.

3. A telephone system, comprising a trunk circuit terminating at one end in a plurality oi groups of switching terminals, a plurality of signaling devices corresponding in num her to the switching terminals of one of said groups, a plurality oi positions at the other end of said trunk, a signaling device at each of said positions, cord circuits, and means for selectively operating a signaling device at one of said positions and one of said first signaling devices, upon the connection of said cord circuits with said trunk circuit.

4. In a telephone system having a pluralit of classes oi telephone lines, signaling means for each of said classes of lines, a trunk circuit, a plurality of operators posi' tions at one end of said trunk, a signaling device at each of said operators positions. cord circuits, means responsive to the connection oi said cord circuits with said trunk circuit tor selectively operating a signaling device at one ot said positions and one nt snitl signaling means to indicate the class of telephone line associated therewith,

in a telephone system, a trunk circuit teri'ninating at one end at a plurality of operators positions and at another end in a plurality of sets of switching terminals adapted to function with a plurality of classes o't telephone lines, and means responsive to the employment of one of said sets of switching terminals for selectively signaling an operator at one of said positions and for ind'it ating the class of telephone line asso iated with said trunk.

ti. in a telephone system, a trunk circuit terminating at one end in a plurality of jacks, e. signaling device for each (it said jacks. a cord circuit, means responsive to the connection of said cord circuit with said trunk circuit by way of one of said jacks for preparing an operating circuit for the signaling device corresponding to the jack enr ployed, a. second cord circuit, and means responsive to the connection of said second cord circuit with said trunk circuit for completing said operating circuit and effecting the operation of the selected signaling device.

7. In a telephone system, a plurality of classes of telephone lines, a trunk circuit terminating at one end in a switching terminal for each class of line, a signaling device for each class of line, a cord circuit, means responsive to the connection of said cord cir cuit with said trunk circuit by way of one of said switching terminals for preparing an operating circuit for selectively operating the signaling device corresponding to the switching terminal employed, a second cord circuit, and means responsive to the connection of said second cord circuit with said trunk circuit for completing said operating circuit and eti'ecting the operation of the selected signalii'ig device to indicate the class of line associated with the trunk.

2 In a telephone system having a plurality ot classes of telephone lines, a signaling device for each of said classes of lines, a trunk circuit, cord circuits, means controlling said signaling devices, and substantially synchroluiusly operated means operated upon the connection of one of said cord circuits with said trunk circuit tor actuating said signal col'itrolling means to prepare a circuit for selectively actuating said signaling devices, said circuit being completed upon the connection of another of said cord circuits with said trunk circuit.

9. In a telephone system having a plurality of classes of telephone lines, a signaling device for each of said classes of lines, a trunk circuit terminating at one end in switching terminals corresponding in number to said classes of lines, a cord circuit, means controlling said signaling devices. substantially synchronously operated means operated in response to the seizure of said trunk by way of one oi said switching terminals for actuating said signal controlling means to prepare a circuit for certain of said signaling devices, a second cord circuit, and means controlled by the connection of said second cord circuit with said trunk for completing said circuit and actuating the signaling device to indicate the class ot telephone line associated with the trunk.

in testimony whereof, I have signed my name to this specification this ltlth day oi October, 192

JOHN I1. TOOMEY.

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